Aryl chlorides and bromides can be easily prepared by electrophilic substitution of arenes with chlorine and bromine respectively in the presence of Lewis acid catalysts. But why does preparation of aryl iodides requires presence of an oxidising agent?
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Iodination reactions are reversible in nature. To carry out the reaction in the forward direction, $\ce{HI}$ formed during iodination is removed by oxidation. $\ce{HIO_4}$ is used as an oxidising agent.
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